Discuss the Carbon Dioxide Density Change and the optimization operation of multimedia classroom

• Main Author: 張維軒
• Other Authors: 陳鴻輝
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/07172102748235596665

碩士 === 明新科技大學 === 土木工程與環境資源管理研究所 === 100 === Indoor air quality is good or bad in the classroom for students to attend class or learn a considerable impact, the student about 10 hours a day in the campus, of which about 8 hours of time in the classroom, therefore indoor air quality healthy learning environment for students should be of considerable attention in the classroom. The purpose of this study was to explore the classroom concentrations of CO2 (Carbon Dioxide), in Situation 1: Air-conditioning is not open, doors and windows open to the indoor air does not produce convection. Situation 2: air-conditioned open the doors and windows closed both case, the best time to exhaust. In this study MingHsin University of Science and Technology Department of Civil Engineering Hall of wireless communication and multimedia teaching classrooms for the experimental site, the classroom volume is 412.21m3, this study was conducted by using the CDU440 Carbon Dioxide Monitor detector, a data record every 5 minutes for 3 hours, to detect the concentration of CO2 in the classroom, through references to CO2 emissions estimate for the hardware in the classroom, final the specification in accordance with the indoor air quality, CO2 concentration recommended value of 600ppm as the evaluation criteria. The results is, in Situation 1: there are 32 people, CO2 concentration in class after 30 minutes, reach 650 ppm, has exceeded the recommended value should be opened to the exhaust fan to exhaust. In Situation 1: there are 24 people, CO2 concentration in class after 10 minutes, reach 640 ppm, has exceeded the recommended value should be opened to the external air circulation；The estimation results of the theoretical value of the carbon dioxide emissions in the human respiratory, per minute exhaled 0.603 g of CO2, measured values in the classroom for 40 people on average0.0204 (g/m3/min), the theoretical estimated value of 0.0585 (g/m3/min), 36 people when the measured value the average .0070 (g/m3/min), theoretical estimated value of .0527 (g/m3/min).